Stadium: Court 4 Round: 29 Ground: Hardcourt indoor
| ITF - M15 St Petersborg - Herredouble | 2021/04/10 12:40 | Cozbinov/Freund v Tajima/Zakharov | 6-4,7-5 |
| ITF - M15 St Petersborg - Herredouble | 2021/04/16 11:05 | Tajima/Zakharov v Pecak/Satral | 3-6,6-2,11-9 |
| ITF - M15 St Petersborg - Herredouble | 2021/04/15 13:45 | Tajima/Zakharov v Ivanov/Ratniuk | 2-6,6-3,13-11 |
| ITF - M15 St Petersborg - Herredouble | 2021/04/13 10:30 | Altuna/Kravchuk v Tajima/Zakharov | 5-7,6-3,4-10 |
| ITF - M15 St Petersborg - Herredouble | 2021/04/10 12:40 | Cozbinov/Freund v Tajima/Zakharov | 6-4,7-5 |
| ITF - M15 St Petersborg - Herredouble | 2021/04/09 10:00 | Pogosian/Sheyngezikht v Tajima/Zakharov | 4-6,1-6 |
| ITF - M15 St Petersborg - Herredouble | 2021/04/06 09:50 | Agabigun/Erel v Tajima/Zakharov | 4-6,1-6 |
| ITF - M15 St Petersborg - Herredouble | 2021/04/16 10:10 | Paul/Steinegger v Cozbinov/Freund | 6-4,3-6,9-11 |
| ITF - M15 St Petersborg - Herredouble | 2021/04/15 10:40 | Deviatiarov/Igoshin v Cozbinov/Freund | 2-6,6-3,6-10 |
| ITF - M15 St Petersborg - Herredouble | 2021/04/13 12:15 | Shchaya-Zubrov/Sheyngezikht v Cozbinov/Freund | 6-7,2-6 |
| ITF - M15 St Petersborg - Herredouble | 2021/04/10 12:40 | Cozbinov/Freund v Tajima/Zakharov | 6-4,7-5 |
| ITF - M15 St Petersborg - Herredouble | 2021/04/09 12:20 | Paul/Steinegger v Cozbinov/Freund | 6-7,2-6 |